I have a QMainWindow which contains a QPlainTextEdit and a button with clicked even connected. When user finishes text input and press the button, I just want to execute user input for example "1+1". I should get "2", but it is "1+1". Very appreciated for your reply, thanks!
import sys
from PyQt5.QtWidgets import QMainWindow, QPushButton, \
QApplication, QVBoxLayout, QPlainTextEdit, QWidget
class MainWindow(QMainWindow):
def __init__(self):
super().__init__()
self.setFixedSize(600, 600)
l_layout = QVBoxLayout()
self.edit = QPlainTextEdit()
self.edit.setFixedSize(400, 300)
self.edit1 = QPlainTextEdit()
self.edit1.setFixedSize(100, 100)
self.btn = QPushButton('Test')
self.btn.clicked.connect(self.press)
l_layout.addWidget(self.edit)
l_layout.addWidget(self.edit1)
l_layout.addWidget(self.btn)
dummy_widget = QWidget()
dummy_widget.setLayout(l_layout)
self.setCentralWidget(dummy_widget)
def press(self):
text = self.edit.toPlainText()
try:
code = """print(text)"""
exec(code)
except Exception as e:
print('not ok!')
app = QApplication(sys.argv)
window = MainWindow()
window.show()
app.exec_()
You should evaluate the input text and then print it, like so:
def press(self):
text = self.edit.toPlainText()
try:
print(eval(text))
except Exception as e:
print('not ok!')
Pay attention, because eval() use can lead to security issues (people executing python code on your app). Make sure your input is sanitized.
Related
from multiprocessing import Process
from tkinter import *
def th():
p = Process(target=Button1)
p.start()
class Button1:
def __init__(self):
btn1.config(state="disabled")
btn1.update()
if __name__ == "__main__":
root = Tk()
root.title("test")
root.resizable(False, False)
btn1 = Button(root, text="시작", width=10, height=5, command=th)
btn1.grid(row=0, column=0, sticky=N+E+W+S, padx=5, pady=5)
root.mainloop()
btn1.config(state="disabled")
NameError: name 'btn1' is not defined
I would appreciate it if you could tell me how to solve it.
I want the button to be disabled when pressed using multi processing.
from PyQt5.QtWidgets import QApplication, QPushButton, QMainWindow
from PyQt5.QtGui import QIcon
import sys
class Main(QMainWindow):
def __init__(self, parent=None) -> None:
super().__init__(parent=parent)
self.setWindowTitle("QPushButton")
left = 300
top = 200
width = 300
height = 250
self.setGeometry(left, top, width, height)
self.show()
def main():
App = QApplication(sys.argv)
Main()
sys.exit(App.exec())
if __name__=="__main__":
main()
I don't get it, it worked before now it closes within a second of opening. I'm thinking somehow my installation got corrupted. Do you have any ideas I tried
def main():
App = QApplication(sys.argv)
Main()
App.exec_()
I want to use a line edit as a search bar in order to find items in a Qlistwidget. I also want the qlistwidget to scroll up/down (in search) as text is being changed in the line edit.
import sys
from PyQt5 import QtWidgets
from PyQt5.QtWidgets import QGridLayout, QWidget, QListWidget, QLineEdit
class Window(QtWidgets.QMainWindow):
def __init__(self):
super().__init__()
centralWidget = QWidget()
self.setCentralWidget(centralWidget)
self.ListBox = QListWidget()
self.ListBox.insertItem(0,'Temperature')
self.ListBox.insertItem(1,'Mass')
self.ListBox.insertItem(2,'Length')
self.ListBox.insertItem(3,'Height')
self.ListBox.insertItem(4,'Width')
self.ListBox.insertItem(5,'Volume')
self.ListBox.insertItem(6,'Surface_Area')
self.ListBox.insertItem(7,'Material')
self.ListBox.insertItem(8,'Location')
self.ListBox.insertItem(9,'Strength')
self.ListBox.insertItem(10,'Color')
self.Search_Bar = QLineEdit()
layout = QGridLayout(centralWidget)
layout.addWidget(self.ListBox)
layout.addWidget(self.Search_Bar)
self.Search_Bar.textChanged.connect(self.Search)
def Search(self):
if self.Search_Bar.text() == 'Strength':
pass
if __name__ == '__main__':
app = QtWidgets.QApplication(sys.argv)
window = Window()
window.show()
sys.exit(app.exec_())
The internally implemented match function provided by all Qt item models is usually faster than cycling through the list via Python.
def Search(self, text):
model = self.ListBox.model()
match = model.match(
model.index(0, self.ListBox.modelColumn()),
QtCore.Qt.DisplayRole,
text,
hits=1,
flags=QtCore.Qt.MatchStartsWith)
if match:
self.ListBox.setCurrentIndex(match[0])
This will automatically select and scroll to the first item found (if any).
I am writing a program with pyqt5 where pressing a button first cycles through some pictures then cycles through some videos.
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from PyQt5.QtMultimedia import *
from PyQt5.QtMultimediaWidgets import *
import glob
import argparse
import sys
class MainWindow(QMainWindow):
def __init__(self,args):
super(MainWindow, self).__init__()
self.setWindowTitle('Navon test')
self.setWindowFlags(Qt.FramelessWindowHint)
# exit option for the menu bar File menu
self.exit = QAction('Exit', self)
self.exit.setShortcut('Ctrl+q')
# message for the status bar if mouse is over Exit
self.exit.setStatusTip('Exit program')
# newer connect style (PySide/PyQT 4.5 and higher)
self.exit.triggered.connect(app.quit)
self.setWindowIcon(QIcon('icon.ico'))
self.centralwidget = CentralWidget(args)
self.setCentralWidget(self.centralwidget)
def keyPressEvent(self, QKeyEvent):
if QKeyEvent.key() == Qt.Key_Escape:
QCoreApplication.instance().quit()
self.centralwidget.startvid()
class CentralWidget(QWidget):
def __init__(self,args):
super(CentralWidget, self).__init__()
self.layout = QVBoxLayout()
self.layout.setAlignment(Qt.AlignCenter)
self.setLayout(self.layout)
self.player = QMediaPlayer(None, QMediaPlayer.VideoSurface)
self.vw = QVideoWidget()
self.player.setVideoOutput(self.vw)
def startvid(self):
self.layout.addWidget(self.vw)
url= QUrl.fromLocalFile(glob.glob("videos/*")[0])
content= QMediaContent(url)
self.player.setMedia(content)
self.player.setVideoOutput(self.vw)
self.player.play()
if __name__== "__main__":
parser = argparse.ArgumentParser()
#~ parser.add_argument("-nb","--nobox",action="store_true", help="do not wait for the box connection")
args = parser.parse_args()
app = QApplication(sys.argv)
mainwindow = MainWindow(args)
#~ mainwindow.showFullScreen()
mainwindow.show()
sys.exit(app.exec_())
I tried to paste the minimal code. The thing is, I press the button nothing shows, although I used examples like this one PyQt5 - Can't play video using QVideoWidget to test if playing the video is ok, and these work. It's as if it is not adding the widget to the layout or something. Any idea what might be wrong?
I had to use QGraphicsView to achieve what I wanted, here is a fix:
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from PyQt5.QtMultimedia import *
from PyQt5.QtMultimediaWidgets import *
import glob
class MainWindow(QMainWindow):
def __init__(self):
super(MainWindow, self).__init__()
self.setWindowTitle('Navon test')
self.setWindowFlags(Qt.FramelessWindowHint)
# exit option for the menu bar File menu
self.exit = QAction('Exit', self)
self.exit.setShortcut('Ctrl+q')
# message for the status bar if mouse is over Exit
self.exit.setStatusTip('Exit program')
# newer connect style (PySide/PyQT 4.5 and higher)
self.exit.triggered.connect(app.quit)
self.setWindowIcon(QIcon('icon.ico'))
self.centralwidget = VideoPlayer()
self.setCentralWidget(self.centralwidget)
def keyPressEvent(self, QKeyEvent):
if QKeyEvent.key() == Qt.Key_Escape:
self.centralwidget.phaseQuit(2)
self.centralwidget.play()
class VideoPlayer(QWidget):
def __init__(self, parent=None):
super(VideoPlayer, self).__init__(parent)
self.mediaPlayer = QMediaPlayer(None, QMediaPlayer.VideoSurface)
self.videoItem = QGraphicsVideoItem()
self.videoItem.setSize(QSizeF(640, 480))
scene = QGraphicsScene(self)
graphicsView = QGraphicsView(scene)
scene.addItem(self.videoItem)
layout = QVBoxLayout()
layout.addWidget(graphicsView)
self.setLayout(layout)
self.mediaPlayer.setVideoOutput(self.videoItem)
self.counter = 0
def play(self):
if self.mediaPlayer.state() == QMediaPlayer.PlayingState:
pass
else:
self.mediaPlayer.setMedia(QMediaContent(QUrl.fromLocalFile(glob.glob("videos/*")[self.counter])))
self.mediaPlayer.play()
self.counter += 1
if __name__ == '__main__':
import sys
app = QApplication(sys.argv)
player = MainWindow()
player.show()
sys.exit(app.exec_())
I am writing a little pyqt application. Now I have start using Qtranslator with *.ts and *.qm files to get a Swedish translation.
I use e.g. self.tr(“Test this”) “Swedish Testar detta”. I am wondering while using the Swedish translation, if it is possible to get back the original untranslated string, in this case “Test this” in the program?
This i my little program and I want the "translate_string" method to print the original string.
from PyQt5.QtWidgets import (QApplication, QDialog, QPushButton, QVBoxLayout)
import sys
from PyQt5.QtCore import (QTranslator)
class Form(QDialog):
def __init__(self):
super(Form, self).__init__()
button = QPushButton(self.tr("&Close"))
self.test_lang = QPushButton(self.tr("Translate"))
self.string = self.tr("Test this")
layout = QVBoxLayout()
layout.addWidget(self.test_lang)
layout.addWidget(button)
self.setLayout(layout)
self.test_lang.clicked.connect(self.translate_string)
button.clicked.connect(self.close)
def translate_string(self):
print(self.string)
if __name__ == '__main__':
app = QApplication(sys.argv)
translator = QTranslator()
translator.load("test_trans_sv_SE.qm")
app.installTranslator(translator)
form = Form()
form.show()
sys.exit(app.exec_())